We have been using the services of Crystal Clear Window Cleaning for several years now. They provide efficient, competent and timely service. They come in once a month to do the work, and they're very conscientious. We don't have to call or follow up, their cleaner shows up just when he's scheduled. He does a great job and leaves our windows very nice and clean. Their staff is polite and friendly. We are very happy with the work they do.